Ergodic Rate Performance In Nonlinear Omnidirectional Coding Mimo-Ofdm Systems

Omnidirectional coding (OC) is established to improve the spectral efficiency of pilot-assisted multiple-inputmultiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. But OC also improves the signal peak to average power ratio (PAPR) at the same time. This paper targets on the ergodic rate performance in OC based MIMO-OFDM systems when nonlinear power amplifier (PA) is considered. Using an inter-modulation product (IMP) analysis, the close-form expressions of ergodic rate in OC based nonlinear MIMO-OFDM system are presented. The ergodic rate performance with/without OC in linear and nonlinear systems is investigated as well. The PA behavioural model is extracted based on measurement of a LDMOS PA.